Production of rubber



naphthylamine,

Patented July. 14, 1931 UNETED STATES PATENT- OFFICE EANS TOGHTWN, OF MANNHEIM, A1\T D CLAUS HEUCK, OF LUIiWIGSHAFZElN-ON-THE BHINE, GERMANY, ASSIGNORS TO I. G. FARBENINDUSTBIE AKTIENGESELLSGHAFT, OF FRANKFORT-ON-THE-MAIN, GERMANY, A. CORPORATION OF GERMANY PBDDUCTION OF RUBBER This invention relates to improvements in the manufacture and production of rubber isoprene which are plastic or elastic or obtained which possess bothproperties are p in a condition particularly stable for stor ing when preserving agents, which expression includes agents for preventing ageing, are added in a dissolved or emulsified form, that is to say finely dispersed in. a liquid, to the emulsions of one of the aforesaid polymerization products and from which said products are to be separated, either be fore 9r during the coagulation, that is to say at some time priorto the completion of the coagulation. 'As examples ofsuch agents may be mentioned the condensation products of aldehydes, in particular aliphatic aldehydes with aromatic amines, such as aldol-alpha-naphthylamine, crotonealdehydeacetaldehyde aniline or phenyl-alpha-naphthylamine.

The aforesaid agents are usuall added in comparatively small amounts, an as a rule in suchamou'nts that 0.5 to 2 er cent thereof is" present in the coagula product. If the emulsion of one of said polymerization products has been thoroughly mixed with the solution or emulsion of the agents above D referred to, these are present in the finished product after coagulation in a state of ex- I tremely fine and uniform dispersion. The

I erization products thus obtained re-' main entirel unchanged-even after having been stored or long periods of time.-

" The process in accordance with the pres ent invention .may be carried out in a articularly advantageous manner by emp oy- 4 No Drawing. Application filed August 19, 1929, Serial No. 887,080, and in Germany September 5, 1928.

ing the emulsions of polymerization products prepared from butadiene or homologues Eavwmple An emulsion of 5 parts of aldol-alphanaphthylamine in 100 parts of water is introduced into an emulsion obtained by polymerization of an emulsion prepared from 200 parts of isoprene, 18 parts of olein or stearic acid, 17.5 parts of a 10 per cent solution of ammonia and 34.0 parts of water. A plastic and elastic product of great stability is obtained after coagulation.-

The first mentioned emulsion is prepared by the introduction of an alcoholic solution of aldol-alpha-naphthylamine, which has been prepared hot, into water. emulsion of the preserving agent havinga good stability may also be prepared in the cold by stirring a solution of 1 part of aldolalphanaphthylaminein 5 parts of ethyl lactate with 15 parts of water. It is advantageous to add agents which reduce the surface tension such as soaps, saponines, aliphatic, hydroaromatic or aromatic sulphonic acids, for example alkyl'ated naphtholic sulphonic acids and/or suitable protective colloids such as glue, agar-agar, gelatine amino acids, albumines, methyl or alkyl cellulose andthe like to the emulsion of the preserving agent.

What we claim is 1; Aprocess for the production of valuable plastic and elastic materials particular- Iy stable for storing and proof against age ing'v from emulsions of polymerization roducts of diolefines, which comprises a ding a preserving agent finely. dispersed in a liquid to said emulsion from which the said not, of a preserving agent polymerization product is to be coagulated, prior to the completion of the coagulatlon.

2. A process for the production of valuable plastic and elastic materials particular- 1y stable for storing and proof against ageing f om emulsions ofpolymerization products of diolefines, which comprises intimate 1y mixing a preserving agent finely dispersed in a liquid with said emulsion from which the said polymerization product is to be coagulated, prior to the completion of the coagulation.

3. A process for the production of valuable plastic and elastic materials particularly stable for storing and proof against age ing from emulsions of polymerization prodnets of diolefines, which comprises intimately mixing between about 0.5 and 2 per cent, based on the weight of the coagulated prodfinely dispersed in a liquid with said emulsion from which the said polymerization product is to be coagulated, prior to the completion of the coagulation.

4. A process for the production of Valuable plastic and elastic materials particularly stable for storing and proof against ageing from emulsions of polymerization products of diolefincs, which comprises adding a condensation product of an aldehyde finely dispersed in a liquid to said emulsion from which the said polymerization product is to be coagulated, prior to the completion of the coagulation.

5. A process for the production of Valuable plastic and elastic materials particularly stable for storing and proof against ageing from emulsions of polymerization products of diolefines, which comprises intimatehyde with an aromatic amine, finely dispersed in a liquid, with said emulsion from which the said polymerization product is to be coagulated, prior to the completion of the coagulation.

6. A process for the production of valuable plastic and elastic materials particularly stable for storing and proof against ageing from emulsions of polymerization products of diolefines, which comprises intimately mixing aldol-alpha-naphthylamine in an emulsified state with a product prepared by the polymerization of isoprene in a state of emulsion, and coagulating. As a new article of manufacture a polymerization product of adiolefine containing apreserving agent in such a degree of dispersion as canbe obtained by adding the preserving agent finely dispersed in a liquid to an emulsion of apolymerization product of a diolefine prior to the completion of the coagulation of the latter emulsion.

8. Asa new article of manufacture a merization product of a diolefine containing between 0.5 and 2 per cent of a preserving y mixing a condensation product of an aldepolyagent in such a degree of dispersion as can be obtained by adding the preserving agent finely dispersed in a liquid to an emulsion of a polymerization product of a diolefine prior to the completion of the coagulation of the latter emulsion.

9. As a new article of manufacture a polymerization product of a diolefine containing between 0.5 and 2 per cent of a condensation product of an aldehyde in such a degree of dispersion as can be obtained by adding the preserving agent finely dispersed in a liquidv to an emulsion of a polymerization product of a diolefine prior to the completion of the coagulation of the latter emulsion.

10. As a new article of manufacture a polymerization product of a diolefine containing between 0.5 and 2 per cent of a conden'sation product of an aldehyde with an aromatic amine in such a degree of dispersion as can beobtained by adding the preserving agent finely dispersed in a liquid to an emulsion of a polymerization product of a diolefine prior to the completion of the coagulation of the latter emulsion.

s a new article of manufacture a polymerization product of a diolefine containing between 0.5 and 2 per cent of aldolalpha-naphthylamine in such a degree of dispersioh as can be obtained by adding the preserving agent finely dispersed in a liquid to an emulsion of a polymerization product of a' diolefine prior to the completion of the coagulation of the latter emulsion.

In testimony whereof we have hereunto set out hands.

HANS TOCHTERMANN. CLAUS HEUCK.

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